Question

what is the quickest moving of all the mollusca phylum?
gastropods
bivalves
cephalopods

Explanation:

Among the Mollusca phylum, Cephalopods (like squids, octopuses) have specialized locomotion (jet propulsion, agile tentacle movement) making them the quickest. Gastropods (snails) and Bivalves (clams) move slower.

Answer:

C. Cephalopods